onCreateViewHolder being called frequently and rapidly

[kcorwin]

I noticed this in the app I'm working on, and it seems to be an issue in the example app as well. When I add logging statements to onCreateViewHolder (for example, in the CountryNamesAdapter in the example), I can see the method being called extremely frequently. Even a very slight scrolling movement will trigger tons of calls - as if it's happening for every redraw. onBindViewHolder is called with the same frequency.

Since onCreateViewHolder is where the expensive operations (xml inflation, findViewById, etc) are supposed to live, this seems like a big performance hit.

[TonicArtos]

Thank you for your bug report.

On inspection this appears to be a caching problem related to computing the position of headers partially off-screen. I imagine there will always be performance issues related to this but once the caching problem is solved the spamming of onCreateViewHolder should calm down.

[TonicArtos]

@kcorwin, All the extraneous calls to onCreateViewHolder should now be fixed. Please use v0.2.1.

[kcorwin]

This is a huge improvement. Thanks for all your work on this!

[TonicArtos]

You're welcome. Please let me know if there is anything else you run into.